Ceremonies were held in New York City, Virginia and Pennsylvania.
July 25 will officially be known as Emmett Till Day in Illinois.
"Stephen Curry: Beyond the Arc" is set to open Friday, celebrating the career of a two-time MVP and the NBA's career leader in 3-pointers. The Naismith Memorial Basketball Hall of Fame said it was the first time in the museum's nearly 75-year history that an active player would have a dedicated feature experience.
John Herbert Dillinger was shot and killed by federal agents outside Chicago's Biograph Theatre on July 22, 1934.
The change happened overnight into Wednesday.
As America celebrates its 250th birthday, members of the country's Indigenous communities explain what the holiday means for them.